Methods, systems, and devices for wireless communication are described. A user equipment (UE) and a base station may communicate according to a timing configuration that includes a time delay between uplink and downlink communications. The time delay may be based on UE capabilities, scheduling in the system, and an uplink timing advance. The UE may determine an uplink timing advance and transmit an indication of the uplink timing advance to the base station. Using the uplink timing advance, the base station may determine a timing configuration to use for communicating with the UE. The timing configuration may be dynamically configured based on the value of the uplink timing advance with respect to a timing advance threshold and may be shortened or lengthened depending on whether the uplink timing advance crosses the timing advance threshold. Multiple timing advance thresholds may be used, and a timing configuration may be selected accordingly.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for wireless communication, comprising: determining an uplink timing advance for a user equipment (UE) based at least in part on a distance between the UE and a base station; determining the uplink timing advance is within a range relative to a timing advance threshold; mapping, based at least in part on determining that the uplink timing advance is in the range, the uplink timing advance to an interval of one or more intervals within the range, wherein each of the one or more intervals spans a respective time period relative to the timing advance threshold; and transmitting, to the base station, an uplink message that indicates that a value of the uplink timing advance is within the range relative to the timing advance threshold based at least in part on mapping the uplink timing advance to the interval, wherein the uplink message indicates the interval and excludes the value of the uplink timing advance.
2. The method of claim 1 , wherein the timing advance threshold is a maximum uplink timing advance value.
3. The method of claim 2 , wherein determining that the uplink timing advance is within the range comprises: identifying the one or more intervals that represent an uplink timing advance value relative to the maximum uplink timing advance value.
4. The method of claim 3 , further comprising: receiving an indication of the one or more intervals from the base station, wherein the indication is UE-specific.
5. The method of claim 3 , wherein the one or more intervals are UE-specific.
6. The method of claim 1 , wherein transmitting the uplink message comprises: periodically transmitting the uplink message.
7. The method of claim 1 , further comprising: receiving, from the base station, an indication of a timing configuration for the UE, the timing configuration based at least in part on the uplink timing advance.
8. The method of claim 7 , wherein the indication of the timing configuration comprises at least one of a transport block size (TBS) limit, a layer constraint, a channel state information (CSI) feedback limit, or a component carrier (CC) limit, or any combination thereof.
9. The method of claim 1 , wherein: determining the uplink timing advance comprises: determining a timing advance for each of multiple timing advance groups (TAGs), wherein the uplink message indicates the timing advance for at least one of the multiple TAGs; and transmitting the uplink message comprises: transmitting multiple uplink messages to the base station, each of the multiple uplink messages indicating the timing advance for at least one of the multiple TAGs.
10. The method of claim 1 , further comprising: determining that the uplink timing advance falls outside the range relative to the timing advance threshold; and refraining from transmitting timing advance feedback to the base station based at least in part on the determining that the uplink timing advance has fallen outside the range relative to the timing advance threshold.
11. An apparatus for wireless communication, in a system comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: receive, from a user equipment (UE), an uplink message that indicates an uplink timing advance for the UE, the uplink message excluding a value of the uplink timing advance and indicating an interval of one or more intervals within a range relative to a timing advance threshold, wherein the uplink timing advance is based at least in part on a distance between the UE and a base station; determine the uplink timing advance is within the range relative to the timing advance threshold based at least in part on the interval included in the uplink message; and determine a timing configuration for the UE based at least in part on the uplink timing advance for the UE and the determination that the uplink timing advance is within the range relative to the timing advance threshold.
12. The method of claim 11 , wherein the set of one or more intervals includes at least two intervals each spanning a timing advance range less than a maximum uplink timing advance value.
13. The method of claim 12 , wherein the set of one or more intervals further includes one or more intervals each spanning a timing advance range greater than the maximum uplink timing advance value.
14. A method for wireless communication, comprising: receiving, from a user equipment (UE), an uplink message that indicates an uplink timing advance for the UE, the uplink message excluding a value of the uplink timing advance and indicating an interval of one or more intervals within a range relative to a timing advance threshold, wherein the uplink timing advance is based at least in part on a distance between the UE and a base station; determining the uplink timing advance is within the range relative to the timing advance threshold based at least in part on the interval included in the uplink message; and determining a timing configuration for the UE based at least in part on the uplink timing advance for the UE and the determination that the uplink timing advance is within the range relative to the timing advance threshold.
15. The method of claim 14 , further comprising: transmitting an indication of the timing configuration to the UE in response to receiving the uplink message.
16. The method of claim 14 , wherein the uplink message comprises one of a set of uplink messages, wherein each uplink message of the set of uplink messages indicates a timing advance for at least one of multiple timing advance groups (TAGs).
17. The method of claim 16 , wherein determining the timing configuration comprises: determining the timing configuration for one or more of the multiple TAGs based at least in part on the indicated uplink timing advance.
18. The method of claim 14 , wherein the timing advance threshold is a maximum uplink timing advance value.
19. The method of claim 18 , wherein determining that the uplink timing advance is within the range comprises: identifying the one or more intervals that represent an uplink timing advance value relative to the maximum uplink timing advance value.
20. The method of claim 18 , further comprising: transmitting an indication of the one or more intervals to the UE, wherein the indication is UE-specific.
21. The method of claim 18 , wherein the one or more intervals are UE-specific.
22. The method of claim 14 , further comprising: setting one or more timing advance thresholds for one or more UEs based at least in part on capabilities of the one or more UEs, wherein the timing configuration for the UE is determined based at least in part on the one or more of the timing advance thresholds.
23. The method of claim 14 , wherein determining the timing configuration comprises: setting multiple timing advance thresholds for the UE, wherein intervals between each of the multiple timing advance thresholds correspond to different timing configurations.
24. The method of claim 14 , further comprising: maintaining a timing advance history for the UE based at least in part on the uplink timing advance.
25. The method of claim 24 , further comprising: determining the timing configuration based at least in part on the timing advance history.
26. The method of claim 24 , further comprising: determining a timing advance report periodicity for the UE based at least in part on the timing advance history.
27. The method of claim 26 , further comprising: transmitting the timing advance report periodicity to the UE.
28. The method of claim 14 , further comprising: modifying a reporting parameter for the UE based at least in part on the uplink timing advance; and transmitting the modified reporting parameter to the UE.
29. The method of claim 28 , wherein the modified reporting parameter comprises at least one of a transport block size (TBS) limit, a layer constraint, a channel state information (CSI) feedback limit, or a component carrier (CC) limit, or any combination thereof.
30. An apparatus for wireless communication, in a system comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: determine an uplink timing advance for a user equipment (UE) based at least in part on a distance between the UE and a base station; determine the uplink timing advance is within a range relative to a timing advance threshold; map, based at least in part on determining that the uplink timing advance is in the range, the uplink timing advance to an interval of one or more intervals within the range, wherein each of the one or more intervals spans a respective time period relative to the timing advance threshold; and transmit, to the base station, an uplink message that indicates that a value of the uplink timing advance is within the range relative to the timing advance threshold based at least in part on mapping the uplink timing advance to the interval, wherein the uplink message indicates the interval and excludes the value of the uplink timing advance.
31. The apparatus of claim 30 , wherein the timing advance threshold is a maximum uplink timing advance value.
32. The method of claim 11 , wherein the interval relative to the timing advance threshold is an interval spanning timing advance values less than a maximum uplink timing advance value.
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November 9, 2017
May 12, 2020
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